This article explains what you need and how to officially download videos (if allowed) from the Peacock app. Once you download something, you can watch it offline.
✅ How to Download and Install Peacock TV App (Full Guide)
As long as you have a Premium Plus account and are using a compatible smartphone or tablet, the download process is quite simple.
Open the Peacock app on your smartphone or tablet and navigate to a movie or TV series you want to save for later.
If it's a downloadable movie, you'll see a Download option under the title (or Download with Premium Plus if you're not a Premium Plus member).